Dear friends, the study note on subsorting, which already has been announced in the X Language Summary version 0.93, is now available at the world wide web under the URL http://www.informatik.uni-bremen.de/~agbkb/CoFI/subsorting.ps.gz or by just clicking on "new study note" in the "Related document" section of the X Language Summary. Comments are welcome! Greetings, Till Mossakowski